Atmospheric and Hydrospheric Earth Rotation Excitations
Matter and motion terms of effective angular momentum functions (EAM) due to mass transport processes in atmosphere, oceans, and the continental hydrosphere are provided with a temporal resolution of down to 3 hours as GFZ's contribution to the Global Geophysical Fluid Center (GGFC) of the International Earth Rotation and Reference Systems Service (IERS).
Available are individual EAM for atmosphere (AAM), dynamic ocean (OAM), continental hydrosphere (HAM), and barystatic sea-level (SLAM). All time-series start in January 1976 and are routinely updated every day at ~10:00 UTC with all 8 time-steps of the previous day. In addition, 3-hourly forecasts of AAM, OAM, HAM, and SLAM for up to 6 days; and combined EAM forecast for up to 90 days into the future are routinely provided.
Figures: Latest Earth rotation effective angular momentum functions (EAM) for the atmosphere (AAM), continental hydrology (HAM), ocean (OAM), and barystatic sea-level (SLAM) for each of the components chi1, chi2 and chi3. The figures show the mass/pressure term (black) and the motion term (blue). Latest 6-day forecast are given in red and green, respectively.
- Dobslaw, H., Dill, R., (2018): Predicting Earth Orientation Changes from Global Forecasts of Atmosphere-Hydrosphere Dynamics. - Adv. Space Res., 61(4), 1047-1054, DOI: doi.org/10.1016/j.asr.2017.11.044.